Examples of org.apache.lucene.index.TermsEnum.seekExact()

org.apache.lucene.index.TermsEnum.seekExact()
Attempts to seek to the exact term, returning true if the term is found. If this returns false, the enum is unpositioned. For some codecs, seekExact may be substantially faster than {@link #seekCeil}.

        }
        termsEnum = terms.iterator(termsEnum);
        assert termsEnum != null;
        
        if (termsEnum == TermsEnum.EMPTY) continue;
        if (termsEnum.seekExact(term.bytes(), false)) {
          if (termContext == null) {
            contextArray[i] = new TermContext(reader.getContext(),
                termsEnum.termState(), context.ord, termsEnum.docFreq(),
                termsEnum.totalTermFreq());
          } else {

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            TermsEnum termsEnum = null;
            SortedSet<BytesRef> joinValues = new TreeSet<BytesRef>(BytesRef.getUTF8SortedAsUnicodeComparator());
            joinValues.addAll(joinValueToJoinScores.keySet());
            for (BytesRef joinValue : joinValues) {
              termsEnum = terms.iterator(termsEnum);
              if (termsEnum.seekExact(joinValue, true)) {
                docsEnum = termsEnum.docs(slowCompositeReader.getLiveDocs(), docsEnum, DocsEnum.FLAG_NONE);
                JoinScore joinScore = joinValueToJoinScores.get(joinValue);


                for (int doc = docsEnum.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; doc = docsEnum.nextDoc()) {
                  // First encountered join value determines the score.

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      DocsEnum docs = null; // reuse
      for (AtomicReaderContext ctx : reader.leaves()) {
        Terms terms = ctx.reader().terms(Consts.FULL);
        if (terms != null) {
          termsEnum = terms.iterator(termsEnum);
          if (termsEnum.seekExact(catTerm, true)) {
            // liveDocs=null because the taxonomy has no deletes
            docs = termsEnum.docs(null, docs, 0 /* freqs not required */);
            // if the term was found, we know it has exactly one document.
            doc = docs.nextDoc() + ctx.docBase;
            break;

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          System.out.println("  useCache=" + useCache);
        }


        final TermsEnum.SeekStatus status;
        if (nextID == null) {
          if (termsEnum.seekExact(new BytesRef(id), useCache)) {
            status = TermsEnum.SeekStatus.FOUND;
          } else {
            status = TermsEnum.SeekStatus.NOT_FOUND;
          }
        } else {

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    Terms terms = indexReader.terms(field);
    if (terms == null) {
      return null;
    }
    TermsEnum iterator = terms.iterator(null);
    if (iterator.seekExact(term, true)) {
      return iterator.docs(bits, null, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
    }
    return null;
  }

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        assert termNotInReader(context.reader(), term) : "no termstate found but term exists in reader term=" + term;
        return null;
      }
      //System.out.println("LD=" + reader.getLiveDocs() + " set?=" + (reader.getLiveDocs() != null ? reader.getLiveDocs().get(0) : "null"));
      final TermsEnum termsEnum = context.reader().terms(term.field()).iterator(null);
      termsEnum.seekExact(term.bytes(), state);
      return termsEnum;
    }
    
    private boolean termNotInReader(AtomicReader reader, Term term) throws IOException {
      // only called from assert

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      final Fields fields = context.reader().fields();
      if (fields != null) {
        final Terms terms = fields.terms(term.field());
        if (terms != null) {
          final TermsEnum termsEnum = terms.iterator(null);
          if (termsEnum.seekExact(term.bytes())) { 
            state = termsEnum.termState();
          } else {
            state = null;
          }
        } else {

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    if (state == null) { // term is not present in that reader
      return TermSpans.EMPTY_TERM_SPANS;
    }
    
    final TermsEnum termsEnum = context.reader().terms(term.field()).iterator(null);
    termsEnum.seekExact(term.bytes(), state);
    
    final DocsAndPositionsEnum postings = termsEnum.docsAndPositions(acceptDocs, null, DocsAndPositionsEnum.FLAG_PAYLOADS);


    if (postings != null) {
      return new TermSpans(postings, term);

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            TermState termState = termContexts.get(term).get(context.ord);
            if (termState == null) {
              // Term not in reader
              continue;
            }
            termsEnum.seekExact(term.bytes(), termState);
            docFreq += termsEnum.docFreq();
          }


          if (docFreq == 0) {
            // None of the terms are in this reader

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          TermState termState = termContexts.get(term).get(context.ord);
          if (termState == null) {
            // Term not in reader
            return null;
          }
          termsEnum.seekExact(term.bytes(), termState);
          postingsEnum = termsEnum.docsAndPositions(liveDocs, null, DocsEnum.FLAG_NONE);


          if (postingsEnum == null) {
            // term does exist, but has no positions
            assert termsEnum.docs(liveDocs, null, DocsEnum.FLAG_NONE) != null: "termstate found but no term exists in reader";

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